!!!! Which of the following is a step in evaluating: ∫ cos2 5x dx

Mathematics

1 answer:

elena55 [62]3 years ago

8 0

It follows from the double angle identity for cosine:

$\cos^2(5x)=\dfrac{1+\cos2(5x)}2=\dfrac{1+\cos(10x)}2$

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